F9 2021 then AA 3931 at Detroit
Philadelphia → Detroit → Miami
Timetable, Detroit time
00:05F9 2021 from Philadelphia at the gate
18:56AA 3931 to Miami leaves the gate
18 h 51 apart on the timetable
AA 3931 leaves 18 h 51 after F9 2021 arrives on the timetable: more than half a day, so not a connection we count.